muPPET: Investigating the Muon Puzzle with J-PET Detectors
A. Porcelli, K. Valsan Eliyan, G. Moskal, N. Nasrin Protiti, D. L. Sirghi, E. Yitayew Beyene, N. Chug, C. Curceanu, E. Czerwiński, M. Das, M. Gorgol, J. Hajduga, S. Jalali, B. Jasińska, K. Kacprzak, T. Kaplanoglu, Ł. Kapłon, K. Kasperska, A. Khreptak, G. Korcyl, T. Kozik, D. Kumar, K. Kubat, E. Lisowski, F. Lisowski, J. Mędrala-Sowa, W. Mryka, S. Moyo, S. Niedźwiecki, S. Parzych, P. Pandey, E. Perez del Rio, B. Rachwał, M. Rädler, S. Sharma, M. Skurzok, E. Ł. Stępień, T. Szumlak, P. Tanty, K. Tayefi Ardebili, S. Tiwari, and P. Moskal
abstract
The muPPET [muon Probe with J-PET] project aims to investigate the Muon
Puzzle seen in cosmic ray air showers. This puzzle arises from the observation of a significantly
larger number of muons on Earth's surface than that predicted by the current
theoretical models. The investigated hypothesis is based on recently observed asymmetries
in the parameters for the strong interaction cross-section and trajectory of an outgoing particle
due to projectile-target polarization. The measurements require detailed information
about muons at the ground level, including their track and charge distributions. To achieve
this, the two PET scanners developed at the Jagiellonian University in Krakow (Poland),
the J-PET detectors, will be employed, taking advantage of their well-known resolution
and convenient location for detecting muons that reach long depths in the atmosphere.
One station will be used as a muon tracker, while the second will reconstruct the core of
the air shower. In parallel, the existing hadronic interaction models will be modified and
fine-tuned based on the experimental results. In this work, we present the conceptualization
and preliminary designs of muPPET.
A Feasibility Study of Attenuation Correction in the J-PET Scanner Using Detector-Scattered Photons
Satyam Tiwari, Sushil Sharma, Pawel Moskal
abstract
Quantitative accuracy in Positron Emission Tomography (PET) depends on reliable attenuation correction (AC) methods, and novel imaging concepts such as positronium lifetime imaging with the Jagiellonian PET (J-PET) system have further highlighted the importance of developing advanced PET methodologies. The clinical standard for AC in PET imaging remains computed tomography (CT). However, this approach increases patient radiation dose and imaging expenses. In recent years, several CT-less attenuation correction methodologies have been proposed to eliminate the need for CT scans. In this work, we present a feasibility study for a CT-less AC approach that utilizes photons undergoing Compton scattering within the PET detector?data typically discarded in conventional analyses. This method is especially well-suited to the J-PET scanner, which is built from long plastic scintillators that inherently produce a significant number of detectable scattered photons.
We performed simulations using the GEANT4 Application for Tomographic Emission (GATE) [6] by modeling a modular J-PET scanner with phantoms having varying attenuation profiles. We then analyzed the Lines of Response (LORs) formed between the first interaction at the detector and the subsequent detection of the scattered photon after it passes through the
phantom and reaches the detector on the opposite side. Our initial findings show that these LORs contain spatial information about the phantom's attenuation distribution, enabling the distinction between varying attenuation density regions. These results demonstrate that detector-scattered photons can serve as an intrinsic data source for generating attenuation maps.
A Feasibility Study of Attenuation Correction in the J-PET Scanner Using Detector-Scattered Photons
Satyam Tiwari, Sushil Sharma, Pawel Moskal
abstract
2nd Symposium on New Trends in Nuclear and Medical Physics
Quantitative accuracy in Positron Emission Tomography (PET) depends on reliable attenuation correction (AC) methods, and novel imaging concepts such as positronium lifetime imaging with the Jagiellonian PET (J-PET) system have further highlighted the importance of developing advanced PET methodologies. The clinical standard for AC in PET imaging remains computed tomography (CT). However, this approach increases patient radiation dose and imaging expenses. In recent years, several CT-less attenuation correction methodologies have been proposed to eliminate the need for CT scans. In this work, we present a feasibility study for a CT-less AC approach that utilizes photons undergoing Compton scattering within the PET detector?data typically discarded in conventional analyses. This method is especially well-suited to the J-PET scanner, which is built from long plastic scintillators that inherently produce a significant number of detectable scattered photons. We performed simulations using the GEANT4 Application for Tomographic Emission (GATE) [6] by modeling a modular J-PET scanner with phantoms having varying attenuation profiles.
We then analyzed the Lines of Response (LORs) formed between the first interaction at the detector and the subsequent detection of the scattered photon after it passes through the phantom and reaches the detector on the opposite side. Our initial findings show that these LORs contain spatial information about the phantom's attenuation distribution, enabling the
distinction between varying attenuation density regions. These results demonstrate that detector-scattered photons can serve as an intrinsic data source for generating attenuation maps.
